如题所述
125 ×(17 × 8)× 4 375 × 480 + 6250 × 48
=125×8×4×17 =480×(375+625)
=1000×68 =480000
=68000
25 × 16 ×125 13 × 99
=25×2×8×125 =13×(100-1)
=50000 =1300-13
=1287
75000 ÷ 125 ÷ 15 7900 ÷ 4 ÷ 25
=75×1000÷125÷15 =7900÷(4×25)
=75÷15×1000÷125 =79
=5×8
=40
150 × 40 ÷ 50 5600 ÷(25 × 7)
=150÷50×40 =56×100÷25÷7
=3×40 =56÷7×100÷25
=120 =32
210 ÷ 42 × 6 39600 ÷ 25
=210÷7÷6×6 =396×100÷25
=30 =396×4
=1584
67 × 21 +18 × 21 + 85 × 79 321 × 81 + 321 × 19
=21×(67+18)+85×79 =321×(81+19)
=21×85+85×79 =32100
=85×(21+79)
=8500
222222 × 999999 333333 × 333333
=222222×(1000000-1) =111111×999999
=222222000000-222222 =111111×(1000000-1)
=222221777778 =111111000000-111111
=111110888889
56000 ÷ (14000 ÷ 16) 654321 × 909090 +654321×90909 =56000÷14000×16 =654321×999999
=4×16 =654321×(100000-1)
=64 =654321000000-654321
=654320345679
34 × 3535 -35 × 3434 27000 ÷ 125
=34×35×101-35×34×101 =27×1000÷125
=0 =27×8
=216
345345 ÷ 15015 347 + 358 + 352 + 349
=345×1001÷(15×1001) =350×4-3+8+2-1
=345÷15×1001÷1001 =1400+6
=23 =1406
75 × 45 + 17 × 25 599996 + 49997 + 3998 + 407 + 89 =25×3×45+17×25 =600000+50000+4000-4-3-2+407+89
=25×(135+17) =65400+487
=25×152 =65887
=25×4×38
=3800
(48 × 75 ×81)÷(24 × 25 × 27)
=48÷24×75÷25×81÷27
=2×3×3
=18
=125×8×4×17 =480×(375+625)
=1000×68 =480000
=68000
25 × 16 ×125 13 × 99
=25×2×8×125 =13×(100-1)
=50000 =1300-13
=1287
75000 ÷ 125 ÷ 15 7900 ÷ 4 ÷ 25
=75×1000÷125÷15 =7900÷(4×25)
=75÷15×1000÷125 =79
=5×8
=40
150 × 40 ÷ 50 5600 ÷(25 × 7)
=150÷50×40 =56×100÷25÷7
=3×40 =56÷7×100÷25
=120 =32
210 ÷ 42 × 6 39600 ÷ 25
=210÷7÷6×6 =396×100÷25
=30 =396×4
=1584
67 × 21 +18 × 21 + 85 × 79 321 × 81 + 321 × 19
=21×(67+18)+85×79 =321×(81+19)
=21×85+85×79 =32100
=85×(21+79)
=8500
222222 × 999999 333333 × 333333
=222222×(1000000-1) =111111×999999
=222222000000-222222 =111111×(1000000-1)
=222221777778 =111111000000-111111
=111110888889
56000 ÷ (14000 ÷ 16) 654321 × 909090 +654321×90909 =56000÷14000×16 =654321×999999
=4×16 =654321×(100000-1)
=64 =654321000000-654321
=654320345679
34 × 3535 -35 × 3434 27000 ÷ 125
=34×35×101-35×34×101 =27×1000÷125
=0 =27×8
=216
345345 ÷ 15015 347 + 358 + 352 + 349
=345×1001÷(15×1001) =350×4-3+8+2-1
=345÷15×1001÷1001 =1400+6
=23 =1406
75 × 45 + 17 × 25 599996 + 49997 + 3998 + 407 + 89 =25×3×45+17×25 =600000+50000+4000-4-3-2+407+89
=25×(135+17) =65400+487
=25×152 =65887
=25×4×38
=3800
(48 × 75 ×81)÷(24 × 25 × 27)
=48÷24×75÷25×81÷27
=2×3×3
=18
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第1个回答 2011-08-16
一、 口算题
1. 105-5×2+3= (105-5)×2+3=
105-5×(2+3)= 105-(5×2+3)=
2. 50+90÷(2×3)= (50+90)÷2×3=
50+90÷2×3= (50+90÷2)×3=
二、 计算题
1. 12520÷8×(121÷11) 2. (2010-906)×(65+15)
3. (639-71×9)÷167 4. (10800-800×4)÷4
希望 对你有帮助
1. 105-5×2+3= (105-5)×2+3=
105-5×(2+3)= 105-(5×2+3)=
2. 50+90÷(2×3)= (50+90)÷2×3=
50+90÷2×3= (50+90÷2)×3=
二、 计算题
1. 12520÷8×(121÷11) 2. (2010-906)×(65+15)
3. (639-71×9)÷167 4. (10800-800×4)÷4
希望 对你有帮助
第2个回答 2012-06-24
45+240÷12 124+78+22 100-35-25
(140-70)×54 63+84×2÷42 490÷7+24×5
26×6-110 345+99 (46-20)×30-90
25×27×4 15×7+85×7 (40-4)×25
125×64 2400÷80-14×2 108-(83+360÷60)
(420+48)÷(375-345) 290-(34×3+99)
142-54÷9+14 240÷16 75×4×25
407-99 16×76-76×6 99×53+53
720÷36÷2 103×35 450-2×(16+9)
245-(45+39) 28×25 473+59+27+1
98×99 125×(8×4)×5 41×25-25
88×125 420÷(205-198)×4 540÷2÷54
460÷(29-18÷3) 720÷36 (960-400)÷70
(140-70)×54 63+84×2÷42 490÷7+24×5
26×6-110 345+99 (46-20)×30-90
25×27×4 15×7+85×7 (40-4)×25
125×64 2400÷80-14×2 108-(83+360÷60)
(420+48)÷(375-345) 290-(34×3+99)
142-54÷9+14 240÷16 75×4×25
407-99 16×76-76×6 99×53+53
720÷36÷2 103×35 450-2×(16+9)
245-(45+39) 28×25 473+59+27+1
98×99 125×(8×4)×5 41×25-25
88×125 420÷(205-198)×4 540÷2÷54
460÷(29-18÷3) 720÷36 (960-400)÷70
第3个回答 2013-08-28
61+4×610+59×61
=61+61×40+61×59
=61×(1+40+59)
=61×100
=6100
99999×77778+33333×66666
=99999×77778+99999×22222
=99999×(77778+22222)
=9999900000
66×21+19×21+85×19
=(66+19)×21+85×19
=85×21+85×19
=85×(21+19)
=85×40
=3400
99×99×199
=(100-1)^2×(200-1)
=(10000+1-200)×(200-1)
=10000×(200-1)-(200-1)^2
=1990000-40000-1+400
=1950399
=61+61×40+61×59
=61×(1+40+59)
=61×100
=6100
99999×77778+33333×66666
=99999×77778+99999×22222
=99999×(77778+22222)
=9999900000
66×21+19×21+85×19
=(66+19)×21+85×19
=85×21+85×19
=85×(21+19)
=85×40
=3400
99×99×199
=(100-1)^2×(200-1)
=(10000+1-200)×(200-1)
=10000×(200-1)-(200-1)^2
=1990000-40000-1+400
=1950399
第4个回答 2012-03-12
15×49+15
=15×49+15×1
=15×(49+1)
=15×50
=750
=15×49+15×1
=15×(49+1)
=15×50
=750